420156436181 has 2 divisors, whose sum is σ = 420156436182. Its totient is φ = 420156436180.

The previous prime is 420156436163. The next prime is 420156436201. The reversal of 420156436181 is 181634651024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355848040900 + 64308395281 = 596530^2 + 253591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420156436181 is a prime.

It is a super-2 number, since 2×420156436181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420156436121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210078218090 + 210078218091.

It is an arithmetic number, because the mean of its divisors is an integer number (210078218091).

Almost surely, 2^420156436181 is an apocalyptic number.

It is an amenable number.

420156436181 is a deficient number, since it is larger than the sum of its proper divisors (1).

420156436181 is an equidigital number, since it uses as much as digits as its factorization.

420156436181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 420156436181 in words is "four hundred twenty billion, one hundred fifty-six million, four hundred thirty-six thousand, one hundred eighty-one".